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Huawei H12-891_V1.0 Exam Syllabus Topics:

Section	Objectives
WAN and VPN Technologies	- MPLS fundamentals 1. VPN technologies 2. MPLS LDP and forwarding
Network Security and QoS	- Security mechanisms 1. Basic network security design 2. ACL and traffic control - QoS mechanisms 1. Traffic classification and shaping
Routing and Switching Technologies	- IP routing protocols 1. BGP 2. OSPF 3. IS-IS basics - Switching technologies 1. VLAN and STP 2. Ethernet switching mechanisms
Network Automation and Programmability	- SDN and automation 1. Network automation tools 2. NETCONF/YANG basics
IPv6 and Advanced IP Technologies	- IPv6 deployment 1. IPv6 addressing and transition
Enterprise Network Architecture	- Network design principles 1. Scalability and high availability design 2. Hierarchical network architecture
Data Center and Virtualization Technologies	- VXLAN and overlay networks 1. Data center network virtualization

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Huawei HCIE-Datacom V1.0 Sample Questions (Q318-Q323):

NEW QUESTION # 318
When judging the old and new LSA, the serial number parameter and the age parameter are used , and the following two parameters are correct for ?( Multiple choice questions).

A. When the router receives-The age of the LSA is set to 3600S, the LSA is unavailable
B. Both the serial number and age parameters can determine whether the LSA is old or new, and the router prioritizes the sequence to participate in the teaching, and the larger the better
C. When the router receives two LSAs, where the sequence number is the same and the checksum is the same, the smaller the age, the better
D. If the serial number of the LSA reaches the end value of Ox7FFFFFFF, the current router advertises an LSA with an age of 3600S

Answer: B,D

NEW QUESTION # 319
S-4S supports multi-instance and multi-process, that is, on an IS-IS router, multiple VPN instances can be configured to associate with multiple IS-S processes, the following description of IS-IS multi-instance and multi-process, which are correct ?

A. If an IS-IS router creates multiple IS-IS processes, each process is independent of each other
B. 1 VPN instances can be associated with several different IS-IS processes
C. 1 IS-IS processes can be associated with several different VPN instances
D. 1 IS-IS processes can only be associated with 1 VPN instance

Answer: A,B,D

NEW QUESTION # 320
What are the differences between traffic policing and traffic shaping?

A. For traffic policing, the usage of the buffer can be adjusted for traffic exceeding the CIR
B. For traffic shaping, the router caches excess packets until bandwidth is available again
C. The token bucket algorithm is used for traffic supervision, and the SPD algorithm is used for traffic shaping
D. For traffic shaping, it can be over-CIR Traffic adjustment for the usage of the buffer
E. Traffic shaping is applied in the inlet direction and traffic supervision is applied in the outlet direction

Answer: B,D

NEW QUESTION # 321
During isis ' broadcast network database synchronization, is the following statement correct?

A. R2 As DIS, Hello time is 3 times that of a normal router.
B. RI and R3 maintain database consistency by periodically sending PSNP requests.
C. R2, as DIS, sends CSNP periodically.
D. R2 as DIS does not receive PSNP nouns for other routes.

Answer: C

NEW QUESTION # 322
IPsec SAs can be established in either manual mode or IKE auto-negotiation mode. Which of the following statements about the two modes is incorrect?

A. SAs established in both manual and IKE auto-negotiation modes can be dynamically updated.
B. In IKE auto-negotiation mode, the encryption and authentication keys required for establishing an SA are generated using the DH algorithm.
C. In manual mode, all parameters (including encryption and authentication keys) required for establishing an IPsec SA need to be manually configured.
D. The lifetime of an SA established in IKE auto-negotiation mode is controlled by the lifetime parameters configured on both ends of the tunnel.

Answer: A

Explanation:
Understanding IPsec SA (Security Association) Establishment
# IPsec (IP Security) provides encrypted communication over IP networks.# Security Associations (SAs) define encryption, authentication, and key parameters for IPsec tunnels.
Two IPsec SA Modes:
1## Manual Mode:
* All parameters (keys, encryption methods, authentication settings) must be manually configured.
* Keys do not change automatically, making it less secure.
2## IKE (Internet Key Exchange) Auto-Negotiation Mode:
* Uses IKE Phase 1 and Phase 2 to automatically negotiate, generate, and exchange keys.
* Keys are periodically refreshed, increasing security.
* Uses Diffie-Hellman (DH) key exchange for secure key generation.
Why is Answer D Incorrect?
# D. SAs established in both manual and IKE auto-negotiation modes can be dynamically updated.
* Incorrect: In manual mode, the IPsec SA is static and does not support dynamic updates.
* Correct behavior: Only IKE auto-negotiation mode supports dynamic re-keying and SA updates.
# Reference: Huawei HCIE-Datacom Guide - IPsec SA Modes and IKE Negotiation

NEW QUESTION # 323
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